package com.kd.kdaicodeuser.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.util.StrUtil;
import com.kd.kdaicodemother.exception.BusinessException;
import com.kd.kdaicodemother.exception.ErrorCode;
import com.kd.kdaicodemother.exception.ThrowUtils;

import com.kd.kdaicodeuser.mapper.UserMapper;
import com.kd.kdaicodemother.model.dto.user.UserQueryRequest;
import com.kd.kdaicodemother.model.entity.User;
import com.kd.kdaicodemother.model.enums.UserRoleEnum;
import com.kd.kdaicodemother.model.vo.LoginUserVO;
import com.kd.kdaicodemother.model.vo.UserVO;
import com.kd.kdaicodeuser.service.UserService;
import com.mybatisflex.core.query.QueryWrapper;
import com.mybatisflex.spring.service.impl.ServiceImpl;
import jakarta.servlet.http.HttpServletRequest;
import org.springframework.beans.BeanUtils;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

import static com.kd.kdaicodemother.constant.UserConstant.USER_LOGIN_STATE;

/**
 * 用户 服务层实现。
 *
 * @author KD
 */
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements UserService {

    @Override
    public long UserRegister(String userAccount, String userPassword, String checkPassword, String userName) {
        //校验参数
        if (StrUtil.hasBlank(userAccount, userPassword, checkPassword, userName)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "请求参数异常");
        }
        if (userAccount.length() < 4) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "账号长度不能小于4");
        }
        if (userPassword.length() < 8) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "密码长度不能小于8");
        }
        if (userName.length() > 14) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "昵称长度不能大于14");
        }
        if (!userPassword.equals(checkPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "两次密码不一致");
        }
        //检查账号是否重复
        QueryWrapper queryWrapper = new QueryWrapper();
        queryWrapper.eq("userAccount", userAccount);
        User user = this.getOne(queryWrapper);
        if (user != null)
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "账号已存在");
        //对密码进行加密
        String encryptPassword = getEncryptPassword(userPassword);
        //添加用户
        User newUser = new User();
        newUser.setUserAccount(userAccount);
        newUser.setUserPassword(encryptPassword);
        newUser.setUserName(userName);
        newUser.setUserRole(UserRoleEnum.USER.getValue());
        boolean save = this.save(newUser);
        ThrowUtils.throwIf(!save, ErrorCode.SYSTEM_ERROR, "用户注册失败,请重新注册");
        return newUser.getId();
    }

    @Override
    public String getEncryptPassword(String userPassword) {
        // 盐值，混淆密码
        final String SALT = "kd";
        return DigestUtils.md5DigestAsHex((SALT + userPassword).getBytes());
    }

    /**
     * 获取已登录用户的脱敏信息
     * @return
     */
    @Override
    public LoginUserVO getLoginUserVO(User user) {
        if (user == null){
            return null;
        }
        LoginUserVO loginUserVO = new LoginUserVO();
        BeanUtils.copyProperties(user, loginUserVO);
        return loginUserVO;
    }

    /**
     * 用户注销
     * @param request
     * @return
     */
    @Override
    public boolean userLogout(HttpServletRequest request) {
        //先判断是否已经登录
        Object userObj = request.getSession().getAttribute(USER_LOGIN_STATE);
        if (userObj == null){
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR, "用户未登录");
        }
        //移除登录态
        request.getSession().removeAttribute(USER_LOGIN_STATE);
        return true;
    }

    /**
     * 用户登录
     * @param userAccount  用户账户
     * @param userPassword 用户密码
     * @param request
     * @return
     */
    @Override
    public LoginUserVO userLogin(String userAccount, String userPassword, HttpServletRequest request) {
        //1.校验参数
        if (StrUtil.hasBlank(userAccount, userPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "请求参数异常");
        }
        String encryptPassword = getEncryptPassword(userPassword);
        //2.根据账号查询用户
        QueryWrapper queryWrapper = new QueryWrapper();
        queryWrapper.eq("userAccount", userAccount);
        queryWrapper.eq("userPassword", encryptPassword);
        User user = this.getOne(queryWrapper);
        //3.判断用户是否存在
        if (user == null){
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户不存在");
        }
        //记录用户的登录态
        request.getSession().setAttribute(USER_LOGIN_STATE, user);
        //获得脱敏后的用户信息
        return this.getLoginUserVO(user);
    }

    /**
     * 获取当前登录用户
     * @param request
     * @return
     */
    @Override
    public User getLoginUser(HttpServletRequest request) {
        //先判断是否已登录
        Object userObj = request.getSession().getAttribute(USER_LOGIN_STATE);
        User currentUser = (User) userObj;
        if (currentUser == null){
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR, "用户未登录");
        }
        //从数据库查询
        Long id = currentUser.getId();
        currentUser = this.getById(id);
        if (currentUser == null){
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR, "用户名或密码错误");
        }
        return currentUser;
    }

    @Override
    public UserVO getUserVO(User user) {
        if (user == null) {
            return null;
        }
        UserVO userVO = new UserVO();
        BeanUtil.copyProperties(user, userVO);
        return userVO;
    }

    @Override
    public List<UserVO> getUserVOList(List<User> userList) {
        if (CollUtil.isEmpty(userList)) {
            return new ArrayList<>();
        }
        return userList.stream().map(this::getUserVO).collect(Collectors.toList());
    }


    @Override
    public QueryWrapper getQueryWrapper(UserQueryRequest userQueryRequest) {
        if (userQueryRequest == null) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "请求参数为空");
        }
        Long id = userQueryRequest.getId();
        String userAccount = userQueryRequest.getUserAccount();
        String userName = userQueryRequest.getUserName();
        String userProfile = userQueryRequest.getUserProfile();
        String userRole = userQueryRequest.getUserRole();
        String sortField = userQueryRequest.getSortField();
        String sortOrder = userQueryRequest.getSortOrder();
        return QueryWrapper.create()
                .eq("id", id)
                .eq("userRole", userRole)
                .like("userAccount", userAccount)
                .like("userName", userName)
                .like("userProfile", userProfile)
                .orderBy(sortField, "ascend".equals(sortOrder));
    }

}
